Dyeing hair with melanin procursors in the presence of iodate and peroxide
US5792220A · kind A · utility
4Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1997 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | May 16, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/492
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention concerns improved processes for dyeing keratinous fibers especially hair on the human scalp using a two-step oxidation process for the oxidation of the melanin precursors 5,6-dihydroxyindoline (DHIN), 5,6-dihydroxyindole (DHI), and derivatives thereof such as 5,6-dihydroxyindole-2-carboxylic acid (DHICA).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.